YouTube

==== TestTube ====
Experimental features of YouTube could be accessed in an area of the site formerly named ''TestTube''.<ref>{{cite web |title=Hidden features of Facebook, WhatsApp, Youtube and more |url=https://www.gadgetsnow.com/slideshows/hidden-features-of-facebook-whatsapp-youtube-and-more/youtube-testtube/photolist/57616832.cms |website=Gadgets Now |language=en |access-date=December 31, 2020 |archive-date=April 13, 2021 |archive-url=https://web.archive.org/web/20210413154208/https://www.gadgetsnow.com/slideshows/hidden-features-of-facebook-whatsapp-youtube-and-more/youtube-testtube/photolist/57616832.cms |url-status=live }}</ref><ref>{{cite web |title=YouTube's Test Tube: What Is It? |url=https://goldengridsystem.com/youtubes-test-tube-what-is-it/ |website=Golden Grid System |date=January 8, 2020 |access-date=December 31, 2020 |archive-date=February 5, 2021 |archive-url=https://web.archive.org/web/20210205142110/https://goldengridsystem.com/youtubes-test-tube-what-is-it/ |url-status=dead}}</ref>
For example, in October 2009, a ''comment search'' feature accessible under <code>/comment_search</code> was implemented as part of this program. The feature was removed later.<ref>{{cite web |title=Google Testing Comment Search On YouTube |url=https://searchengineland.com/google-testing-youtube-comment-search-27900 |website=Search Engine Land |date=October 16, 2009 |access-date=December 31, 2020 |archive-date=December 9, 2020 |archive-url=https://web.archive.org/web/20201209151338/https://searchengineland.com/google-testing-youtube-comment-search-27900 |url-status=live }}</ref> Later the same year, ''YouTube Feather'' was introduced as a "lightweight" alternative website for countries with limited internet speeds.<ref>{{cite web |title=Slow YouTube? Try Feather, Made for India |url=https://www.gtricks.com/youtube/slow-youtube-feather-india/ |website=Gtricks |date=December 7, 2009 |access-date=December 31, 2020 |archive-date=February 13, 2021 |archive-url=https://web.archive.org/web/20210213032953/https://www.gtricks.com/youtube/slow-youtube-feather-india/ |url-status=live }}</ref> Following the transition to the Polymer layout, TestTube was disabled, and the URL redirects to video playback settings. TestTube was replaced by a new system that requires users to be premium members to enable or disable experiments.